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<p>This study focuses on the bacterial and chemical synthesis of CuO nanoparticles and their application in the photocatalytic degradation of high-density polyethylene (HDPE). The band gap energies of the CuO nanoparticles synthesized via bacterial and chemical methods were found to be 1.48 and 1.46&#xa0;eV, respectively. The particle sizes ranged from 16 to 32&#xa0;nm for the bacterially synthesised nanoparticles and 55.7 to 75.9&#xa0;nm for the chemically synthesised ones. Photocatalytic degradation of the HDPE sheet, confirmed by a weight loss of 20.54 ± 0.66% after 100&#xa0;h of UV irradiation, was achieved using bacterially synthesized CuO nanoparticles. Response Surface Methodology (RSM) was employed to design a statistical model using Central Composite Design (CCD). The optimal nanoparticle concentration (29.6–30&#xa0;mg) and photocatalysis duration (283–300&#xa0;h) yielded a desirability score of 1.0. Gas Chromatography–Mass Spectrometry (GC–MS) was used to identify the metabolites produced before and after photocatalysis, further confirming HDPE degradation. Comparison of the bacterially and chemically synthesized CuO nanoparticles revealed negligible differences in photocatalytic performance. However, bacterially synthesized nanoparticles were selected for the scale-up process due to their smaller size and environmentally friendly synthesis. To the best of our knowledge, this is the first study reporting the degradation of HDPE using both chemically and biologically synthesized CuO nanoparticles.</p>

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Degradation of High-Density Polyethylene Using CuO Nanoparticles Produced from Biological and Chemical Synthesis Route

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Rajalakshmi Sridharan,
  • B. Swathi Pandey,
  • B. Senthil Rathi,
  • P. Senthil Kumar,
  • Veena Gayathri K.,
  • Gayathri Rangasamy

摘要

This study focuses on the bacterial and chemical synthesis of CuO nanoparticles and their application in the photocatalytic degradation of high-density polyethylene (HDPE). The band gap energies of the CuO nanoparticles synthesized via bacterial and chemical methods were found to be 1.48 and 1.46 eV, respectively. The particle sizes ranged from 16 to 32 nm for the bacterially synthesised nanoparticles and 55.7 to 75.9 nm for the chemically synthesised ones. Photocatalytic degradation of the HDPE sheet, confirmed by a weight loss of 20.54 ± 0.66% after 100 h of UV irradiation, was achieved using bacterially synthesized CuO nanoparticles. Response Surface Methodology (RSM) was employed to design a statistical model using Central Composite Design (CCD). The optimal nanoparticle concentration (29.6–30 mg) and photocatalysis duration (283–300 h) yielded a desirability score of 1.0. Gas Chromatography–Mass Spectrometry (GC–MS) was used to identify the metabolites produced before and after photocatalysis, further confirming HDPE degradation. Comparison of the bacterially and chemically synthesized CuO nanoparticles revealed negligible differences in photocatalytic performance. However, bacterially synthesized nanoparticles were selected for the scale-up process due to their smaller size and environmentally friendly synthesis. To the best of our knowledge, this is the first study reporting the degradation of HDPE using both chemically and biologically synthesized CuO nanoparticles.